/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/ObjectFilter/ObjectMixerEditorObjectFilter.h
Determines if transient objects (such as Sequencer Spawnables) should be shown in the list. False by default.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintNativeEvent, BlueprintCallable, Category="Object Mixer") virtual bool GetShowTransientObjects() const